Hi Ciara,
I've got a Vytec with the wireless option. So far I think it's a great computer - I've done about 10 dives on it. The air integration feature is great, and I haven't seen any interference from either camera strobes (Ikelite) or HID lights (Halcyon), while using them in conjunction. The display is easy to read, and an added benefit for me is the user changeable units - I can dive in PSI/feet like my buddies in the USA, but then switch units and review my dives in BAR/metres if I choose to (and vice versa). I haven't used the gas switching capabilities yet, but that was one of the reasons I bought it. Originally I was looking for a nitrox computer that could be used in gauge mode as well for future technical diving, which was leading me to the Vyper, but the Vytec was available with the air integration.
I wanted to replace the strap with a bungee strap, but so far have found the watch style strap with a buckle to be sturdy, and reasonably depth compensating. I might end up replacing it with a Waterborne strap one day, to reduce the risk of losing the computer from my wrist.
Overall I'm glad I bought it. The only setback is the cost if you buy the optional transmitter, which almost doubles the cost of the computer. If you don't want air integration, and don't want gas switching capability (eg. using EAN50 for deco after diving EAN32, etc), the Vyper may be an economical alternative.
Simply Scuba in the UK had the best price I could find at time of purchase, although DiveInn now carry Vytecs. VAT may be an issue for you if purchasing online, as to whether or not it is included in the online price.
Ben